As Morgey and Stu said, it's nice someone is trying to hack the ecu again, but don't get your hopes up too high as the odds aren't in our favor. A few facts that have been found earlier: The Toyota ECU, according to its own documents works on a formula basis. It's suspected that this is to stop people from screwing around with your car. This is also why you need to reset your ECU after each modification for maximum and speedy results. The Toyota ECU uses a formula based on one map and the ECU only has one filled in table, the others are blank. As you drive the car populates these cells. As a matter of fact, if you reset the ECU and make the car cycle for about ten minutes, it will fill the cells within the optimum setting. Most of the aftermarket ECUs use a daughterboard, there are a few exceptions like the TOM's and the PowerFC. The original theory that the stock ECU is used until certain parameters are met then a switch over to the daughterboard is incorrect. The stock ECU is completely out of the picture at least in the case of the JAM ECU. The daughterboard runs the whole show. The data on the EPROM is encrypted and a chip on the other side of the daughterboard decrypts it before passing it to the processor. Therefore reading the EPROM is a useless endeavor. This is obviously to ensure that JDM rivals don't simply load up and copy their chips. Tectom seems to be the only non-factory thing capable of reading the Toyota factory ECU, but they no longer make such a system due to pressure from Toyota. The Toyota ECU cannot be hacked its just simply read and dumped to another system which can be modified. Toyota JDM tuners go through nuff measures to keep their chips safe.